My latest obsession is a project for K12 science education. It’s an Internet-of-Things enabled weather station that can be built for less than $35 if you have access to a 3D printer. Check out the progress of the project on the WxImp page. All of the code is released under a Mozilla Public License and the .stl files to print the mechanical parts yourself on nearly any 3d printer are released under a Creative Commons license. Stay Tuned!
3/16/18 Update: Don’t try to build this yet. There’s a problem with the housing design. See the road map for details.